Intermittent thermosyphon

Abstract

The device and methods described herein relate to the isothermal heat transport through an intermittent liquid supply to an evaporator device, thereby enabling high evaporative heat transfer coefficients. A liquid and vapor mixture flows through miniature and micro-channels in an evaporator and addresses flow instabilities encountered in these channels as bubbles rapidly expand. Additionally, a high percentage of the fins are exposed to vapor and limit the required charge of refrigerant t within the system due to effective condensate removal in the condenser.

I claim: 
     
       1. A thermosiphon comprising: a condenser;
 an evaporator fluidly coupled to the condenser through a vapor tube and a liquid tube; 
 the evaporator having a top, a bottom and sides, wherein the top is configured with an orifice positioned proximate to the middle of the evaporator in fluidic communication with the vapor tube, and the top is also configured with two or more orifices positioned proximate to the perimeter of the evaporator in fluidic communication with the liquid tube; 
 wherein liquid enters the evaporator from the liquid tube and vapor exits the evaporator to the vapor tube; 
 a plurality of evaporator fins positioned within the evaporator creating channels therebetween, wherein at least a portion of the plurality of evaporator fins having cut-outs allowing vapor to flow between the channels, wherein each of the plurality of evaporator fins also having cut-outs allowing liquid to flow between the channels; and 
 a vapor blocking fin configured without cut-outs allowing vapor to flow between channels positioned adjacent to the orifice proximate to the perimeter of the evaporator to limit the vapor backflow from the evaporator into the liquid tube. 
 
     
     
       2. The thermosyphon of  claim 1 , where the liquid tube and the vapor tube are substantially horizontal when in use. 
     
     
       3. The thermosyphon of  claim 1 , further having a plurality of condenser fins positioned within the condenser. 
     
     
       4. The thermosyphon of  claim 1 , wherein the plurality of evaporator fins are oriented laterally, with lateral flow channels therebetween, with each evaporator fin having an end aligned along a first longitudinal edge and the opposing edge aligned along a second longitudinal edge. 
     
     
       5. The thermosyphon of  claim 1 , where the vapor blocking fin has liquid cut-outs allowing liquid to freely pass through. 
     
     
       6. The thermosyphon of  claim 1 , wherein the vapor blocking fin is tuned for a specific power range.